Sulfite-boiler plant.



\ J. K. RUTHSQ SULFITE BOILER PLANT.

APPLICATION FILED FEB. 24. 1911.

1,292,080. Patented Jan. 21, 1919.

By I

UNITE STATES PATENT OFFICE.

JOHANNES KARL RUTHS, OF DJURSHOIIM, SWEDEN, ASSIGNOR TO AKTIEBOLAGET VAPORACKUMULATOR, OF STOCKHOLM, SWEDEN.

SU-LFITE-BOILER PLANT.

Specification of Letters Patent.

Patented J an. 21, 1919.

To all whom it may concern:

Be it known that I, JOHANNES KARL RUTHs, doctor-engineer, subject of the King of Sweden, residlng at Djursholm, in the Kingdom of Sweden, have invented certain new and useful Improvements in Sulfite- Boiler Plants, of which the following is a specification. I

In the operation of sulfite boilers a certain amount of steam isusually passed through the filled boiler before the actual boiling takes place. The carrying out of this process, called steaming process, requires about 45 minutes. During the steaming the wood chips sink together and the boiler may therefore be filled once more after the steaming has been finished, said subsequent filling requiring about 10 minutes. Eventually the steaming is repeated for about 15 minutes. As the time for the first filling usually amounts to 20 minutes,

* altogether about 90 minutes are thus re-.

quired-for filling and steaming.

The present invention relates to an arrangement whereby the time for steaming and filling is reduced to a minimum. A short steaming time is, evidently, of great importance for obtaining the eatest possible output per boiler which lncreases according as the steaming time decreases. Hltherto, however, a I'ilgfld steaming has been impossible with regar to the steam boiler plant in view of the fact that the steaming requires a large amount of steam which must be distributed over a comparatively long time in order not to force the steam boiler plant. A forced working of the steam boilers would greatly reducethe pressure of the steam and cause a disturbance in the operation of engines, etc., operated from the steam boilers.

In addition the boiler plants hitherto known have the disadvantages incident to an 'irregular firing and which are inevitable even with the comparatively long steaming. time now used.

According to my invention, however, a considerable shortenin of the steaming period is made possibli without a forced working of the steam boiler plant being necessary. On the contrary, the boiler plant "is relieved to a great extent of variations in load and pressure and the economy of the total plant is thereby increased.

This advantage is obtained chiefly by the arrangement that the steam for the steaming is not led directly from the steam boilers to the sulfite boilers but first to a steam accumulator which in turn supplies steam when required.

By this arrangement the flow of steam from the steam boilers to the accumulator may be regulated so as to obtain a constant flow, corresponding to the distribution of the total amount of steam required for the steaming over the whole period between two steaming operations. The steam boilers are thereby subjected to a more uniform pressure than previously in spite ofthe steaming period being considerably shorter. In certain cases the charging steam may even be supplied particularly during, the times when' the steam boilers are only slightly loaded. In this way the accumulator may balance to a considerable extent also variations caused by other loads.

The accompanying drawing shows diagrammatically an arrangement according to my invention. The steam boilers A supply steam to the steam conduit L. Through the conduit G and the control valve V a uniform amount of steam balanced according to the total load is flowing to the accumulator B. During the steaming periods steam is then supplied from the accumulator through the pipe R to the sulfite boiler C.

In addition to the shortening of the steaming time obtained by the insertion of an ac, cumulator between the steam, boilers and the sulfite boiler or boilers in the way described a shortening of the tqtaltime required for steaming and filling'may also be effected by a modified steaming process consisting in admitting the steam for the steaming to the boiler C at the lower part thereof instead of the upper part as hitherto usually done. The boiler is filled as before with chips but the steam for the steaming is adtween the said generator and boiler, a steam In testimony whereof I aflix my signature conduit from the said!1 generator to thefsaid in presence of two witnesses.

accumulator, a secon steam conduit rom the latter to the said boiler, and a means in JOHANNES KARL RUTHS" 5 the first steam conduit for controlling the Witnesses:

flow of steam from the said generator to GRETA Pawn,

the said accumulator. GUSTAF JANssom 

